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2023 IEEE MTT-S International Wireless Symposium, IWS 2023

作者： Qi, Huanhuan Liu, Haiwen Huang, Mo School of Information and Communications Engineering Xi' An Jiaotong University Xi'an China Faculty of Science and Technology State Key Laboratory of Analog and Mixed-Signal Vlsi China Institute of Microelectronics University of Macau Department of Electrical and Computer Engineering China

ISBN: (纸本)9798350336535

In this paper, a novel filtering balun based on microstrip-to-slotline transition is proposed. Utilizing the inherent out-of-phase electric field distributions on the adjacent grounds of slotline, the balun function is realized. In order to realize the wide notched-band and stopband performance for radio astronomical applications, spoof surface plasmon polariton (SSPP) metamaterial and multi-mode hairpin ring resonators (HRRs) are adopted. With these novel structures loaded, the proposed filtering balun exhibits a wide band from 1GHz to 6 GHz. The notched band is from 3.2 GHz to 4.4 GHz, within the notched band, the rejection level is better than 15 dB. Besides, the out-of-band suppression is below 35 dB in the wide frequency range from 6 GHz to 8 GHz. © 2023 IEEE.

关键词： Metamaterials

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A Preliminary Study of Frequency Shift Mechanism in Magnetic Resonance Coupled Human Body Communication

A Preliminary Study of Frequency Shift Mechanism in Magnetic...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Chen, Lina Wang, Jiamei Wei, Ziliang Pun, Sio Hang Vai, Mang I. Gao, Yueming College of Physics and Information Engineering Fuzhou University China Fuzhou University The International Joint Laboratory on Health Intelligent Monitoring Systems China University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI China University of Macau Faculty of Science and Technology China

ISBN: (纸本)9798350358971

The Magnetic Resonance-Coupled Human Body Communication (MR-HBC) method presents advantages such as high path gain and enhanced information security, rendering it particularly suitable for establishing wireless body area networks. The optimal operation of MR-HBC relies on functioning at resonance frequency. However, owing to the intricate dielectric properties of human tissues and individual differences, the resonance frequency of communication systems frequently experiences varying degrees of deviation. To delve into the intrinsic mechanism behind frequency shifts, this paper establishes a finite element model based on the genuine dielectric properties and geometric structure of the human body. It investigates the augmentation effects of human tissue on MR-HBC, examines the influence of distinct tissue electrical properties on the electromagnetic field distribution of MR-HBC, and analyzes the inherent connection between frequency shifts and human tissue electrical characteristics. The results reveal that the electrical properties of human tissues stand as the primary factor affecting frequency shifts, with the extent of frequency deviation contingent upon the proportional composition of different tissues. © 2023 IEEE.

关键词： Electromagnetic simulation MR-HBC Resonance Frequency Shift

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A Channel Gain Measurement Method for Magnetic Resonance Human Body Communication

A Channel Gain Measurement Method for Magnetic Resonance Hum...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Chen, Bingheng Wei, Ziliang Huang, Lixuan Pun, Sio Hang Vai, Mang I. Gao, Yueming College of Physics and Information Engineering Fuzhou University China Fuzhou University The International Joint Laboratory on Health Intelligent Monitoring Systems China University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI China University of Macau Faculty of Science and Technology China

ISBN: (纸本)9798350358971

Magnetic Resonance Coupled Human Body Communication (MR-HBC) is a promising human communication method with high efficiency and stability. Designing devices that utilize MR-HBC for communication requires accurate channel transmission characteristics for effective communication. However, MR-HBC has difficulty obtaining reliable channel gains. Due to the existence of an additional return path caused by parasitic capacitance during channel gain measurements, there are significant differences in the results of different measurement methods, and the measured channel gain does not necessarily correspond to the actual channel gain. In this regard, this paper proposes a method that can accurately measure the actual channel gain of MR-HBC. By modeling the electrical connection during the measurement of the measuring instrument, this paper shows that the additional return path between the transmitter and receiver in the experimental measurement is the reason for the discrepancy between the channel gain measurement results and the actual ones. Proposed that a balun device should be added to suppress the additional return path during the MR-HBC channel gain measurement in order to measure the realistic channel gain, and this is verified by experiments. The results show that before adding the balun, the MR-HBC channel gain measurements of different measurement methods show significant differences (maximum difference of 20.4 dB). When the additional return path is suppressed by adding the balun device, the measurement results of different measurement methods are consistent and close to the realistic measurement results measured using a small device (maximum difference of 2.5 dB). This study addresses the accuracy of measurement results during MR-HBC channel gain measurements. © 2023 IEEE.

关键词： additional return path channel gain MR-HBC

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An analog Front-End with Automatic Gain Control for Galvanic-Coupled Human Body Communication

An Analog Front-End with Automatic Gain Control for Galvanic...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Zhao, Wenxiang Li, Dongming Wang, Jiamei Pun, Sio Hang Vai, Mang I. Gao, Yueming College of Physics and Information Engineering Fuzhou University China Fuzhou University The International Joint Laboratory on Health Intelligent Monitoring Systems China University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI China Faculty of Science and Technology University of Macau China

ISBN: (纸本)9798350358971

The channel loss of galvanic-coupled human body communication (GC-HBC) is greatly affected by human body activities or individual differences, which will cause large changes in the amplitude of the input signal received by the receiver. This requires the analog front-end to have the ability to adaptively adjust the circuit gain to ensure stable output of the amplified signal. In this regard, this paper proposes an analog front-end with automatic gain control for GC-HBC. This circuit uses a differential preamplifier circuit with high input impedance and a rear-stage automatic gain control circuit that uses voltage feedback to control gain. While achieving amplification of weak signals, it also meets the requirements for stable signal output. The measurement results show that it has an input impedance of > 100 M Ω, a maximum gain of 74dB, and a sensitivity of - 76dBm, effectively meeting the needs for capturing and amplifying weak signals. The loop stabilization time is 156μs, and the input dynamic range is 34dB, which can ensure stable output of the amplified signal amplitude when the input signal amplitude changes. © 2023 IEEE.

关键词： analog front-end automatic gain control GC-HBC stable output

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Real-Time vibration locating phase-sensitive OTDR based on envelope extraction and undersampling technique 20

Real-Time vibration locating phase-sensitive OTDR based on e...

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20th International Conference on Optical Communications and Networks, ICOCN 2022

作者： Yu, Feihong Shao, Liyang Liu, Shuaiqi Xu, Weijie Xiao, Dongrui Liu, Huanhuan Shum, Perry Ping Southern University of Science and Technology Department of Electrical and Electronic Engineering Shenzhen China University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI China

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

Real-Time vibration localization and phase demodulation at a low system cost are still the challenges for phase-sensitive optical time-domain reflectometry (Phi-OTDR). In this paper, undersampling technique is utilized to decrease the data volume, also contributing to the reduction of the system cost. Digital envelope extraction is applied to quickly locate the vibration, and phase demodulation with the undersampled data is also performed for waveform analysis. This flexible scheme improves the real-Time performance of the system, also offering an enhancement to the applicability of Phi-OTDR. © 2022 IEEE.

关键词： Extraction

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A Comparative Study of the Electrodes Gels’Electrical Properties in the Measurement Issues of Intrabody Communication

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Journal of Beijing Institute of technology 2022年第1期31卷 71-80页

作者： Fengjie Lin Ziliang Wei Jiejie Yang Yangrong Wen Yueming Gao Sio Hang Pun Mang I Vai Min Du College of Physics and Information Engineering Key Laboratory of Medical Instrumentation&Pharmaceutical Technology of Fujian ProvinceFuzhou UniversityFuzhou 350108China State Key Laboratory of Analog and Mixed-Signal VLSI University of MacaoTaipaMO 999078China

Intrabody communication(IBC)technology is becoming progressively more standard-ized due to its low power consumption and high security features incorporated into the third phys-ical layer of the IEEE 802.15.6 *** then,there are still many challenges in normalizing the measurement issues of IBC.A major concern that should not be overlooked is the electrodes in the IBC,especially the popular use of gel *** the channel measurements,gel electrodes are commonly employed to improve the signal-to-noise ratio and prevent electrodes from falling *** this paper,a comparative study of the electrical properties of gel was investigated during the measurement of human channel characteristics and to clarify the differences of ***,the basis of electrostatic field pole plate measurements and electromagnetic theory were introduced to interpretate how the relative permittivity and conductivity of different gels will influence the meas-urement *** the in vivo experiments with different gel or dry electrodes were performed to compare the differences induced by the *** results indicate that the influence of the gel on the human channel measurement is mainly concentrated below 400 kHz(the attenuation is re-duced by 16.7 dB on average),and the stability of the permittivity and conductivity of the gel has a direct impact on the stability of its measurement of the human *** result may provide a meaningful reference for the standardization of electrode usage in IBC.

关键词： intrabody communication channel characteristic measurement gel electrodes permit-tivity conductivity

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A Deadbeat Current Controller for Thyristor-Controlled LC-Coupling Hybrid Active Power Filter 48

A Deadbeat Current Controller for Thyristor-Controlled LC-Co...

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48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Sou, Wai-Kit Gong, Cheng Wong, Chi-Kong Lam, Chi-Seng State Key Laboratory of Analog and Mixed-Signal Vlsi University of Macau China University of Macau Institute of Microelectronics China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering China

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

Thyristor-controlled LC-coupling hybrid active power filter (TCLC-HAPF) is a promising current quality compensator in the medium-voltage-level power system, which is characterized by a wide operational range and low DC-link voltage. Based on the simplified discrete model, this paper proposes a deadbeat current control (DBCC) scheme for the TCLC-HAPF. The proposed controller can lead TCLC-HAPF to be operating at a fixed switching frequency and track the reference compensating current accurately with a fast transient response. Simulation studies under both balanced and unbalanced load conditions are conducted to verify the proposal. © 2022 IEEE.

关键词： Thyristors

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Fiber Ring Cavity Laser Based on Cascading two Peanut-Shape Structures for Liquid Level Measurement 13

Fiber Ring Cavity Laser Based on Cascading two Peanut-Shape ...

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13th International Conference on Information Optics and Photonics, CIOP 2022

作者： Lin, Weihao Sun, Siming Zhao, Fang Hu, Jie Liu, Shuaiqi Yu, Feihong Shao, Liyang Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau 999078 China

ISBN: (纸本)9781510660632

In this letter, a new method for liquid level measurement based on in-line Mach Zehnder interferometer (MZI) in fiber ring laser cavity is proposed and experimentally demonstrated. Two cascaded peanut-shaped fiber structures are designed to implement MZI with a length of 25 mm. At the beginning, the broadband light source was used to demonstrate the possibility of MZI as a liquid level sensor. The experimental results show that the liquid level sensitivity of -1.057 nm/cm can be achieved in the detection range of 0-20 mm. However, using broadband light sources to build a sensing system has a large 3-dB spectral bandwidth and low signal-to-noise ratio in the available wavelength range. Therefore, these sensing systems may have poor resolution, low accuracy monitoring and limited detection distance. Therefore, the experiment further uses the fiber ring laser (FRL) cavity to replace the broadband light source to realize the liquid level monitoring. Thanks to narrow laser linewidth and high signal-to-noise ratio, higher detection accuracy can be obtained. MZI acts as a filter and a sensor at the same time. When the liquid level changes, the interference peak shift plays the role of filtering and wavelength selection. The results showed that the detection sensitivity was as high as -1.348 nm/cm. Accompanied by a signal-to-noise ratio of up to 50 dB and a 3-dB linewidth of less than 0.2 nm. Besides, the fiber ring laser cavity can theoretically extend the length of single-mode fiber infinitely in the cavity. Hence, the sensor designed is exemplary and representative for liquid level monitoring in unconventional areas in the far field such as: extreme geological landforms, high temperature and high-pressure regions and anaerobic areas. © 2022 SPIE.

关键词： Single mode fibers

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Data compression in heterodyne phase-sensitive OTDR using quantization technology 8

Data compression in heterodyne phase-sensitive OTDR using qu...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Yu, Fei-Hong Liu, Shuaiqi Xu, Wei-Jie Shao, Liyang Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau 999078 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

The combination of phase-sensitive optical time-domain reflectometry (F-OTDR) and deep learning algorithms is a popular research topic in recent years. To train the classification models established by these algorithms, a huge amount of data is required. Though F-OTDR can monitor the applied perturbations along the sensing fiber continuously, the huge volume of data puts a heavy burden on storage devices. In this paper, we propose a lossy data compression method based on quantization technology to solve the data storage problem in heterodyne F-OTDR. Experimental results show that the vibration waveform can be successfully restored from the reconstructed signal. A compression ratio of 16 is achieved by quantifying a 128-MB data to 31.25 MB with 293.2-ms time consumption. With the proposed quantization method, it is expected to be able to store more sensing data without making modifications to the hardware. © 2022 SPIE

关键词： Reflectometers

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Disturbance recognition for F-OTDR based on Faster-RCNN 8

Disturbance recognition for F-OTDR based on Faster-RCNN

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Xu, Wei-Jie Liu, Shuaiqi Yu, Fei-Hong Shao, Liyang Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau 999078 China

ISBN: (纸本)9781510653115

This paper proposes a disturbance recognition method for phase-sensitive optical time-domain reflectometry (F-OTDR) based on Faster-RCNN. The method achieves high-speed detection of intrusion location and classification with high accuracy. Our scheme makes full use of the 2D sensing information on spatial-temporal images and uses the advanced "two-step" object detection algorithm Faster-RCNN to achieve real-time operation. Firstly, to improve the detection speed, Region Proposal Network (RPN) and Region of Interest (RoI) are used. Secondly, our CNN-based approach can extract features automatically of disturbance events from spatial-temporal images. So, it has better robustness compared to traditional machine learning methods. Thirdly, the method uses an end-to-end CNN object detection model that integrates multiple modules into a single network. Therefore, it has a significant advantage in detection speed. We conducted data collection under perimeter security scenarios and acquired 4 types of events with a total of 4987 samples. The four events contain "rigid collision", "hitting net", "shaking net", and "cutting net", which are representative in the perimeter security scenario. Experimental results proves that our method can achieve a real-time operation (0.1659 s processing time for 0.5 s sensing data) with high accuracy (96.32%), shows great potential in real-time disturbance detection for online monitoring industrial application of F-OTDR. © 2022 SPIE

关键词： Object detection

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